#include <REGX52.H>
#include "Delay.h"

/**
  * @brief 矩阵键盘读取按键键码  
  * @param  无
  * @retval KeyNumber 按下按键的键码值
	        如果按下不放，程序会停留在此函数，返回按键键码，没有按键按下时，返回0
  */

unsigned char MatrixKey()
{
	unsigned char KeyNumber=0;
	
	P1=0xFF;
	P1_3=0;
	if(P1_7==0)
		{
			Delay(20);
			while(P1_7==0);
			Delay(20);
			KeyNumber=1;
		}
	if(P1_6==0)
		{
			Delay(20);
			while(P1_6==0);
			Delay(20);
			KeyNumber=5;
		}
	if(P1_5==0)
		{
			Delay(20);
			while(P1_5==0);
			Delay(20);
			KeyNumber=9;
		}
	if(P1_4==0)
		{
			Delay(20);
			while(P1_4==0);
			Delay(20);
			KeyNumber=13;
		}
	P1=0xFF;
	P1_2=0;
	if(P1_7==0)
		{
			Delay(20);
			while(P1_7==0);
			Delay(20);
			KeyNumber=2;
		}
	if(P1_6==0)
		{
			Delay(20);
			while(P1_6==0);
			Delay(20);
			KeyNumber=6;
		}
	if(P1_5==0)
		{
			Delay(20);
			while(P1_5==0);
			Delay(20);
			KeyNumber=10;
		}
	if(P1_4==0)
		{
			Delay(20);
			while(P1_4==0);
			Delay(20);
			KeyNumber=14;
		}
	P1=0xFF;
	P1_1=0;
	if(P1_7==0)
		{
			Delay(20);
			while(P1_7==0);
			Delay(20);
			KeyNumber=3;
		}
	if(P1_6==0)
		{
			Delay(20);
			while(P1_6==0);
			Delay(20);
			KeyNumber=7;
		}
	if(P1_5==0)
		{
			Delay(20);
			while(P1_5==0);
			Delay(20);
			KeyNumber=11;
		}
	if(P1_4==0)
		{
			Delay(20);
			while(P1_4==0);
			Delay(20);
			KeyNumber=15;
		}
	P1=0xFF;
	P1_0=0;
	if(P1_7==0)
		{
			Delay(20);
			while(P1_7==0);
			Delay(20);
			KeyNumber=4;
		}
	if(P1_6==0)
		{
			Delay(20);
			while(P1_6==0);
			Delay(20);
			KeyNumber=8;
		}
	if(P1_5==0)
		{
			Delay(20);
			while(P1_5==0);
			Delay(20);
			KeyNumber=12;
		}
	if(P1_4==0)
		{
			Delay(20);
			while(P1_4==0);
			Delay(20);
			KeyNumber=16;
		}
	
	return KeyNumber;
}